The implementation can indeed combine multiple different CRDTs. Within Loro's internal implementation, each op does need to store a parent ID. However, as Seph

The implementation can indeed combine multiple different CRDTs. Within Loro's internal implementation, each op does need to store a parent ID. However, as Seph mentioned, consecutive operations under the same parent can be effectively compressed, so the amortized overhead of these parent IDs is often not significant.